JPH05184432A - Inclination controller of chair - Google Patents

Abstract

PURPOSE:To prevent a spring from unexpectedly changing in elastic resistance against backward inclination of a backrest of a chair in which the elastic resistance of the spring against the inclination of the backrest is automatically increased in proportion to the body weight of a person who sits on the chair. CONSTITUTION:Component members of a link mechanism such as a slider 122, etc., are kept in locked state in connection to the backward inclination of a backrest by providing a lock device such as a lock 146 with an elastic resistant element 147. As the elastic resistance (stiffness) of a spring 129 against the backward inclination of the backrest is kept in a state adjusted corresponding to the body weight of a person who sits on a chair, a comfortable locking state can be kept continuously.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chair in which a backrest is provided so as to be tiltable rearwardly against spring means, and the elastic resistance of the spring means to the rearward tilting of the backrest depends on the weight of a person sitting on the chair. The present invention relates to an improvement of a tilting control device that is automatically adjusted by means of the above.

[0002]

2. Description of the Related Art The applicant of the present application, in a chair in which a backrest is tilted backward against the elasticity of spring means, is constructed so that the seat body is lowered by an amount corresponding to the weight of the person. In the interlocking mechanism that operates in association with the amount of downward movement of the body, the spring constant of the spring means is automatically increased by moving the point of application of the backrest load to the spring means, or the interlocking mechanism causes the spring means to move. By moving the back and forth from the center of rotation of the backrest, the elastic resistance of the spring means to the back tilting of the backrest is automatically increased in proportion to the weight of the person sitting on the chair. Actual Kaihei 3-1
No. 22740, Jitsukaihei 4-48854, etc.).

[0003]

As described above, when the elastic resistance of the spring means against the rearward tilting of the backrest is automatically increased in proportion to the weight of the person sitting on the chair, the person can sit on the chair. Even if the weight of the person is different, the same degree of reaction force is applied to the back of the person leaning against the backrest, so that a comfortable rocking state can be provided regardless of the weight of the person.

However, in the conventional tilt control device,
When the downward load on the seat body changes, the point of action of the load on the spring means and the spring means move immediately, in other words, the elastic resistance of the spring means to the rearward tilting of the backrest,
It will always be sensitive to changes in downward load on the seat. For this reason, for example, if a person leans back slightly while leaning against the backrest, the elastic resistance of the spring means to the backrest changes immediately,
There was a problem that a comfortable locking state could not be secured in some cases.

The present invention aims to solve this problem.

[0006]

To achieve this object, the present invention comprises a seat and a backrest that tilts backwards against the elasticity of the spring means, the spring means and a backrest load for the spring means. By moving the point of action relative to the seat body through an interlocking mechanism that operates with a downward load on the seat body, the elastic resistance of the spring means against the rearward tilting of the backrest is increased by the magnitude of the downward load on the seat body. In the chair configured to increase in accordance with the height, lock means is provided for holding the interlocking mechanism in an inoperable state in relation to the rearward tilting of the backrest.

[0007]

In this structure, when a person sits on the chair, the point of action of the backrest load on the spring means or the spring means moves through the interlocking mechanism by an amount corresponding to the weight of the person sitting on the chair. By doing so, the elastic resistance of the spring means to the rearward tilting of the backrest is adjusted to increase in proportion to the weight of the person sitting on the chair. In that case, since the locking means for the interlocking mechanism does not work when the person just sits down on the seat, the elastic resistance of the spring means against the back tilting of the backrest should be accurately adjusted to a value corresponding to the weight of the person. It can be adjusted.

That is, the function of adjusting the elastic resistance of the spring means by the interlocking mechanism is not impaired. Then, when a person sitting on a chair leans against the backrest, the interlocking mechanism becomes inoperable by the locking means, so even if the person lifts his / her back while leaning against the backrest, the action of the load on the spring means No points or spring means move, so
The elastic resistance of the spring means against the rearward tilting of the backrest will be kept in a state set according to the weight of the person.

Therefore, according to the present invention, the elastic resistance of the spring means to the backrest when the person sitting on the chair leans on the backrest without impairing the adjusting function of the elastic resistance of the spring means against the rearward tilting of the backrest. Since it can be kept in a state set according to the weight of the person sitting on it, it has the effect of being able to reliably maintain and maintain a comfortable rocking state regardless of light weight ..

[0010]

Embodiments of the present invention will now be described with reference to the drawings. 1 to 16 show a first embodiment using a ratchet mechanism as a locking means. In these figures, the chair denoted by reference numeral 1 is a support mechanism 3 provided at the upper end of the leg body 2.
And a seat body 4 attached to the support mechanism 3, and a backrest 5 integrally connected to the seat body 4.

The seat body 4 is made up of seat plates 4a, 4b made of synthetic resin or the like which are divided into front and rear and a cushion body 4c stretched over the seat plates 4a, 4b.
As shown in FIG. 5, the front seat plate 4a and the rear seat plate 4 are formed in a zigzag shape in a plan view so that the front seat plate 4a and the rear seat plate 4b are joined together. , It is designed so that they can be separated from each other in an overlapping state in a side view. The backrest 5 includes a backrest plate 5a and a cushion body 5b stretched on the front surface thereof. Further, the rear seat plate 4b and the backrest plate 5a are integrally connected.

The support mechanism 3 has a box-shaped rotation with a fixed frame body 6 fixed to the upper end of the leg body 2 and having a generally U-shaped cross section and an upward opening fitted to the fixed frame body 6 from below. The moving frame 7 is provided, and the left and right side plates 7 of the rotating frame 7 are provided.
a, 7a at the rear end portions of the fixed frame body 6 on both left and right side plates 6
a, 6a are pivotally attached by a pair of left and right first pivots 8 extending horizontally, and a rear end portion 7b 'of the bottom plate 7b of the rotating frame body 7 is abutted on the lower surface of the fixed frame body 6. I am letting you. Therefore, the rotating frame body 7 can only tilt forward.

Left and right side plates 7a of the rotating frame body 7,
A side view L in which the backrest 5 is attached to a portion near the rear end of 7a.
The front end portion of the character-shaped tilting motion body 9 is provided with a pair of left and right second pivots 10.
On the other hand, a cantilever-shaped load acting portion 11a is extended rearward on the inner surface of the front plate 7c of the rotating frame 7 as an example of spring means for the rearward tilting of the tilting motion body 9. A pair of left and right torsion coil springs 11 are arranged.
As shown in FIGS. 5 and 12, the second pivot 10 has
The collar 12 is fitted.

The tilting moving body 9 has a base body 13 formed of a metal plate or the like, a support 14 made of synthetic resin or the like fixed to the upper surface of the base body 13 with a screw, and has an L-shape in a side view. The base body 1 is provided with two formed frames 15.
3. The downward projection 14a formed on the support 14 is fitted into the longitudinally extending recess 13a formed in FIG. 3, and the left and right side plates 14b, 14b formed substantially in the middle of the front and rear of the support 14 are attached to the rotary frame body. The left and right side plates 7a, 7a of 7 are pivotally attached by the second pivot 10.

Further, the horizontal portion 15a of the frame 15 is fixed to the base body 13, and the left and right frames 15, 1 are
The upper end of 5 is connected by a connecting rod 16 having a U-shape in a plan view, and a cylindrical body 16a having upper and lower openings fixed to both left and right ends of the connecting rod 16.
A bushing body 17 with a brim, which is made of a hard synthetic resin or the like and is formed so as to be flexibly deformed, is fitted into the bushing body 1.
A cylindrical portion 5c integrally formed on both left and right side portions of the backrest plate 5a is fitted on the backrest plate 5a (see FIGS. 2, 3 and 5).

Further, the support 1 in the tilting motion body 9
4, a tubular portion 18 that is open upward and a first guide body 19 that has a key groove 19a that extends in the vertical direction are integrally connected to each other at a portion approximately in the middle between the left and right rear portions of the tubular portion 18 A guide bush 20 is inserted into the guide bush 20, and a guide cylinder 22 protruding downward from a rear support plate 21 made of synthetic resin or the like that supports the rear seat plate 4c is inserted into the guide bush 20.
Into the guide cylinder 22, a weight-sensing coil spring 23 for lowering the seat body 4 according to the weight of the person sitting on the chair 1 is fitted.

On the lower surface of the front end portion of the rear support plate 21, as a member forming a part of the interlocking mechanism, a first vertical rack 24 having rack teeth formed on the front surface is fixed by screwing. The first rack 24 is vertically slidably fitted into the key groove 19a of the first guide body 19 of the support body 14. Further, the support 14 in the tilting motion body 9 is used.
The left and right side plates 14b, 14b of the first pinion gear 2 meshing with the first rack 24 as part of an interlocking mechanism.
A pinion shaft 25 having 5a is rotatably supported via a shaft body 26, and the first pinion gear 25 is provided on both left and right sides of the pinion shaft 25 sandwiching the first pinion gear 25a.
The second pinion gear 25b having a larger diameter than that of the second pinion gear 25b is formed on the left and right outer sides of the second pinion gear 25b (Figs. 4, 6, 10).
reference).

As shown in FIG. 4, FIG. 6, FIG. 8 and FIG. 10, etc., two positions corresponding to the second pinion gear 25b on the upper surface of the support body 14 of the tilting motion body 9, A second guide body 28 having a U-shaped cross section with an upward opening and having a guide groove 28a formed on the inner side surface is fixed to the left and right second guide bodies 28, 28, and rack teeth are provided on the upper surface as a part of an interlocking mechanism. A second rack 30 having a groove formed therein is slidably mounted back and forth, and wing pieces 30a projecting from the side surfaces of both the second racks 30 are slidably fitted back and forth in the guide groove 28a of the second guide body 28. To meet.

Further, a support pin 32 with a roller 31 is mounted between the front ends of the left and right second racks 30 and 30, and the support pin 32 is located at a portion in front of the second pivot shaft 10 to the left and right. Load acting part 11 of both torsion coil springs 11
It is configured so that it can contact a. It is not always necessary to fit the roller 31 on the support pin 32. In this case, a stopper projection 29 with which the support pin 32 abuts is formed on the upper surface of the support body 14 of the tilting motion body 9 so as to regulate the retracted positions of the left and right second racks 30. Therefore, when the tilting motion body 9 does not rotate, the load acting portion 11a of the torsion coil spring 11 contacts the stopper projection 29, and the load acting portion 11a of the torsion coil spring 11 and the support pin 32 are contacted. A small gap e1 is provided between the roller 31 and the roller 31.

The left and right torsion coil springs 11 and 11
Is a third penetrating through the left and right side plates 7a, 7a of the rotating frame body 7.
The shock-absorbing member 34, which is fitted to the pivot 33 and has a semicircular cross section, is formed on the coil portions of the left and right torsion coil springs 11 and 11 by a material that is slightly elastically deformable such as hard rubber.
Is disposed so as to contact the third pivot 33 with the flat surface 34a thereof being positioned obliquely downward. Therefore, the torsion coil spring 11 elastically supports the rearward tilting of the tilting motion body 9 by deforming the buffer member 34 and reducing the diameter of the coil portion.

The left and right torsion coil springs 11,
11 is supported by a support piece 35 formed by cutting and raising the bottom plate 7b of the rotating frame body 7 (see FIG. 8). Further, the front plate 7c of the rotating frame body 7 has a torsion coil spring 1
The torsion coil spring 1 is brought into contact with the fixed end 11b
A bolt 36 adapted to adjust the initial elastic force of No. 1 is screwed (see FIGS. 6 and 8). As shown in FIG. 6, the support shaft 33 is fitted with a collar 37 for preventing lateral displacement of the torsion coil spring 11.

As shown in FIG. 8, a front support plate 38 is fixed to a horizontal flange portion 7d formed at the front end of the rotating frame body 7, and the front seat plate 4a is attached to the front support plate 38. It is stuck. Further, an arm body 39 having a U-shaped cross-section that extends obliquely upward toward the rear is fixed to the rear end portion of the fixed frame body 6, and both left and right side plates 39a, 3 of the arm body 39 are fixed.
A long slot 40 extending obliquely in a side view is formed in the upper end portion of 9a, while a connecting portion 41 between the rear seat plate 4b and the backrest plate 5a is formed in a backward convex shape in a side view. A pair of left and right brackets 42 extending substantially downward are integrally or separately formed at a connecting portion 41 between the rear seat plate 4c and the backrest 5, and a guide pin 43 inserted into both the left and right brackets 42, 42 is provided in the arm. The rear seat plate 4 is inserted into the left and right long holes 40, 40 of the body 39.
It is configured such that b and the backrest 5 are tilted backward while descending.

Reference numeral 44 shown in FIG. 6, FIG. 12 to FIG. 13 and FIG. 16 holds the second rack 30 in the forward position with the tilting motion body 9 tilted backward, and the spring constant of the torsion coil spring 11 is maintained. Fig. 6 shows a locking means according to the present invention adapted to hold at an adjusted value. The locking means 44 includes a pair of left and right ratchet wheels 25c, 25c formed on the pinion shaft 25.
And ratchet pawl 45 arranged near each of the ratchet wheels 25c
And the ratchet pawl 45 is formed in a substantially downward opening C shape in a side view, and the upper end of the ratchet pawl 45 is erected on the supporting body 14 of the tilting motion body 9 and the bracket plate 1.
By pivotally attaching to the 4c with the left and right long pins 46,
When the ratchet pawl 45 rotates, the pawl portion 45a of the ratchet pawl 45 moves.
5c, and further, by the torsion spring 47 fitted on the pin 46, the claw portion 4 of the ratchet claw 45.
5a is biased in a direction away from the ratchet wheel 25c.

Then, the base body 13 and the support body 14 of the tilting motion body 9 are provided with a through hole 48, and a vertically long and vertically rotatable member 49 inserted into the through hole 48 is attached to a left and right longitudinal pin 50. Pivotally attached to the base body 13 and the rotating member 5
While the lower end of 0 contacts the upper surface of the bottom plate 6b of the fixed frame body 6, the ratchet pawl 45 is attached to the upper end of the rotating member 49.
A wide engaging portion 49a that fits in the downward recess 45b is formed, the upper surface of the engaging portion 49a is formed in an upward convex arc shape, and the jaw portion 49b near the rear end of the engaging portion 49a is formed into a circle. It is formed in an arc shape.

In the above structure, when a person sits on the chair 1, the rear seat plate 4c descends against the elasticity of the coil spring 23 for applying a feeling of weight, and in conjunction with the descending movement of the rear seat plate 4c,
Since the pinion shaft 25 rotates via the first rack 24, the left and right second racks 30, 30 move forward as indicated by the alternate long and short dash line in FIG. 8 and the solid line in FIG. Then, the supporting span L1 of the left and right torsion coil springs 11 and 11 becomes short (see FIG. 8), and the left and right torsion coil springs 11 and 11 are reduced.
Spring constant increases.

At this time, since the spring constant of the weight-sensing applied coil spring 23 is constant, the descending amount of the rear seat plate 4c is proportional to the weight of the person sitting on the chair 1.
The amount of movement of the racks 30, 30 also increases in proportion to the weight of the person sitting on the chair 1, and as a result, the left and right torsion coil springs 1
The spring constants of 1 and 11 increase in proportion to the weight of the person sitting on the chair 1.

When the person sitting on the chair 1 leans against the backrest 5, the tilting motion body 9 tilts rearward about the left and right second pivots 10, as shown by the solid line in FIG.
The backrest 5 and the rear seat plate 4c are tilted rearward, and the rearward tilting of the tilting motion body 9 is elastically supported by the left and right torsion coil springs 11 and 11 via the support pins 32. At this time, when the tilting motion body 9 tilts backward, the rotation member 49 moves to the position shown in FIG.
By rotating the ratchet pawl 45 against the torsion spring 47 by rotating in the direction of arrow A shown in FIG. 2, the pawl portion 45a of the ratchet pawl 45 meshes with the ratchet wheel 25c (see FIG. 16). As a result, the pinion shaft 25 is irreversibly held, and the position of the second rack 30 is held unchanged. As a result, the second rack 30 shifts even if the person leans back against the backrest 5 and floats. There is nothing to do.

Therefore, the spring constant of the torsion coil spring 11 is kept in a state of being adjusted to the weight of the person sitting on the chair 1, and a comfortable rocking state is obtained for each person having a different weight. Can be maintained. Then, the person raises the upper body from the backrest 5 and tilts the moving body 9
When is returned to the original posture, the ratchet pawl 45 and the rotating member 49 are returned to the original posture and rotated by the spring force of the torsion spring 47, and the engagement between the ratchet pawl 45 and the ratchet wheel 25c is released.

In this case, the downward recess 4 of the ratchet 45
5b and the engaging portion 49a of the rotating member 49 have the shapes as shown in the drawing, the ratchet pawl 45 is attached to the ratchet wheel 25.
The claw wheel 25c is in the direction of arrow B (second
Rack 30 can be rotated in the direction of advancing)
Therefore, the rearward tilting of the tilting motion body 9 is allowed while maintaining the state where the ratchet claw 45 is in contact with the ratchet wheel 25c.

As in the embodiment, the torsion coil spring 11
Is positioned in front of the second pivot 10 that is the pivotal attachment portion of the tilting motion body 9, the support pin 32 moves away from the second pivot 10 as shown in FIGS.
Ratio (L2: L) of the distance L2 from the pivot 10 to the support pin 32 and the distance L3 from the second pivot 10 to the backrest 5.
3) becomes smaller, and the load acting on the torsion coil spring 11 becomes smaller than when the tilting motion body 9 tilts backward without the second rack 30 moving forward.

That is, the increasing rate of the load acting on the torsion coil spring 11 becomes smaller than the increasing rate of the backrest load, and not only the spring constant of the torsion coil spring 11 increases, but also the third rack 30 operates. The forward movement itself also increases the elastic resistance to the rearward tilting of the tilting motion body 9. Therefore, the function of increasing the elastic resistance of the torsion coil spring 11 according to the increase in the backrest load is further improved. be able to.

As shown in FIGS. 8, 9 and 12, a stopper body 55 having an L-shape in side view is formed on the lower surface of the rear end portion of the base body 13 of the tilting motion body 9, and By contacting the horizontal portion 55a at the lower end with the lower surface of the rear portion of the fixed frame body 6, the forward tilt angle of the tilting motion body 9 is regulated. This stopper body 55 has a tilting motion body 9
A notched hole 55b to be fitted into the leg body 2 when the tilting motion body 9 is tilted backward is formed so that the tilting backward is allowed.

By the way, in the case where the rotary frame body 7 is constructed so as to be able to tilt forward as in the embodiment, when the tilting motion body 9 tilts backward due to a person leaning against the backrest 5, the tilting motion body 9 is tilted.
Tilts rearward about the second pivot 10. In that case,
The rotating frame body 7 can be tilted forward about the first pivot 8, and when the tilting motion body 9 is tilted backward, there is no means for elastically supporting the forward tilting of the rotating frame body 7. Therefore, when a person leans on the backrest 5 and swings the entire body back and forth without changing the angle between the upper body and the lower body, the tilting angle of the tilting motion body 9 with respect to the rotating frame body 7 is held unchanged. As it is, the rotating frame body 7 and the tilting motion body 9 are tilted forward about the first pivot 8, and the seat body 4 and the backrest 5 are
There is a possibility that a state where the elastic force of the torsion coil spring 11 does not act on and occurs.

Regarding this point, FIG. 7, FIG. 10 to FIG.
As shown in FIG. 5, a pair of left and right tilt guide means 56 provided between the tilting motion body 9 and the fixed frame body 5 copes with the problem.
That is, the front-rear tilt guide means 56 includes a pair of left and right first bracket plates 5 respectively arranged at a pair of left and right first punched holes 57 formed in the bottom plate 7b of the rotating frame 7.
8 and a protrusion 59 projecting downward from the support 14 of the tilting motion body 9 between the left and right first bracket plates 58, 58. Guide holes 61 fixed to the fixed frame body 6 are formed in the left and right first bracket plates 58, 58 into which the guide pins 60 fixed to the protrusions 59 are fitted.

At this time, the tilting motion body is formed by forming the guide hole 61 into an elongated hole having a substantially longitudinal length so that the tilting motion body 9 is allowed to rotate about the second pivot 10. In the state in which 9 is tilted rearward, the rotating frame body 7 is configured so as not to be tilted forward, and further, at the rear end of the guide hole 61, an inclined portion 61a extending obliquely rearward in a side view is continuously formed. Then, the tilting motion body 9 and the rotating frame body 7 are configured so as to be able to tilt forward about the first pivot 8.

Further, a means for elastically supporting the forward tilting of the rotating frame 7 by the torsion coil spring 11, that is, the torsion coil spring 11 is installed at the lower portion of the support mechanism 3. As a means to be used together with the spring means for the rearward tilting of the body 4 and the backrest 5 and the forward tilting of the seat body 4,
A pair of left and right link bodies 62 formed in a lateral V shape in a side view.
Are arranged.

That is, the left and right link bodies 62 are arranged at the right and left portions of the second punched hole 63 formed in the bottom plate 7b of the rotating frame body 7 at appropriate intervals. The rear end of 62 is pivotally attached to the second bracket plate 64 projecting from the fixed frame body 6 in a substantially forward direction by a pin 65 extending in the left-right direction, while the lower ends of the front portions of both link bodies 62, 62 are rotated by The pair of left and right downwardly facing pieces 66, 66 formed by cutting and raising the bottom plate 7b of the moving frame body 7 are pivotally attached by a left and right longitudinal pin 67 with a collar 67a.
The upper end of the front part of 2 is brought into contact with the part of the lower surface of the base body 13 of the tilting motion body 9 in front of the second pin 10.

However, when the tilting motion body 9 tilts backward, the posture of the rotating frame body 7 does not change, so that the tilting motion body 9 is separated from the link body 62, and the tilting motion body 9 is freely moved. Can tilt backwards. On the other hand, the seat body 4 and the rotating frame body 9
If the link body 62 does not exist, the tilting motion body 9 and the turning frame body 7 integrally tilt forward, and the tilting movement of the turning frame body 7 is elastically supported. There is no such thing.

However, since the link body 62 is provided at a portion between the first pivot 8 and the coil portion of the torsion coil spring 11, as shown conceptually in FIG. Is a constant angle θ, the torsion coil spring 1
Since the descending amount h2 of the link body 62 is smaller than the descending amount h1 of 1, the torsion coil spring 11 moves downward against its elasticity, and the torsion coil spring 1
The elastic deformation of 1 elastically supports the forward tilting of the rotating frame body 7 and the tilting motion body 9.

In this case, when the person sitting on the chair 1 leans forward, the force acting on the front part of the seat body 4 acts on the tilting motion body 9 when leaning against the backrest 5. Since the force is smaller than the force, when the torsion coil spring 11 simply supports the forward tilting of the rotating frame body 7, the torsion coil spring 11 is too hard, and it becomes difficult to tilt the seat body 4 forward. ..

However, in the construction of the embodiment, the tilting moving body 9 is also tilted forward, and the torsion coil spring 11 is elastically deformed, so that the person sitting on the chair 1 only tilts his body forward. Even if there is, the seat body 4 and the tilting motion body 9 can be surely tilted forward, and therefore, with one torsion coil spring 11, both the back tilting of the backrest 5 and the front tilting of the seating body 4 can be performed. It can be properly supported.

In this case, as described above, the tilting moving body 9
Since the forward tilt angle is restricted to the constant range θ by the stopper body 55, after the forward tilt of the tilting motion body 9 is stopped, only the rotating frame body 7, in other words, only the front seat plate 4a. Therefore, it is tilted forward against the elastic force of the torsion coil spring 11. In addition, in the embodiment, the backrest 5 itself can be slightly bent and deformed. Therefore, when a person sitting on the chair 1 leans against the backrest 5, the backrest 5 is deformed so as to be tilted rearward as a whole and to be closely attached to the back of the person. Also, the backrest 5 is formed by the guide action of the long hole 40 in the arm body 39.
Is pulled downwards and becomes selfish, so the backrest 5
The tilting motion body 9 tilts backward at an angle smaller than the tilting angle.

FIG. 17 shows a second embodiment of the locking means utilizing the ratchet mechanism. In this example,
The ratchet pawl 45 is formed in an L shape in a side view, and the connecting portion of the vertical portion 45c and the horizontal portion 45d is pivotally attached to the left and right side plates 6a, 6a of the fixed frame body 6 by a pin 46, The portion 45c extends upward from a hole 48 formed in the base body 13 and the support body 14 of the tilting motion body 9 to form a claw portion 45a at the upper end of the vertical portion 45c, and on the upper surface of the horizontal portion 45d. , The base 13 of the tilting motion body 9
The tip of a leaf spring 68 fixed to the lower surface of the ratchet is fixed, and the horizontal portion 45d of the ratchet pawl 45 is supported by a compression spring 69 having a weaker spring force than the leaf spring 68.

In this embodiment, when the tilting motion body 9 is tilted backward, the ratchet pawl 45 is moved through the leaf spring 68.
By rotating the ratchet wheel 25c in the direction of arrow B while being biased to rotate in the direction in which it meshes with 5c, and the ratchet wheel 45c is in contact with the ratchet wheel 45c, the ratchet wheel 25c rotates in the direction of arrow B.
When the rear seat plate 4b is allowed to descend and the rotation of the ratchet wheel 25c is stopped, the ratchet claw 45 has a claw portion 45a.
The pinion shaft 25 is held in a non-reversible manner by meshing with c.

When the ratchet mechanism is used as the locking means as in the above two embodiments, the second rack 3
The ratchet track is formed on the interlocking member that reciprocates like 0, and the ratchet pawl provided on the support body 14 or the like is engaged with or disengaged from this, or the ratchet track is formed on the support body 14, and the pinion The ratchet pawl provided on the interlocking member such as the shaft 25 may be disengaged.

Further, only the backrest may be attached to the tilting motion body. Next, a third embodiment (FIGS. 18 to 29) in which an elastic friction body such as rubber is used as the locking means.
Will be described. Chair 101 in the third embodiment
Also, the support mechanism 103 provided at the upper end of the pedestal 102, the seat body 104 having the seat plates 104a and 104b and the cushion body 104c, which are divided into the front and rear, and the tilting motion body 105 having an L-shape in side view, And a backrest 106 attached to the support mechanism 103.

The support mechanism 103 includes a fixed frame body 107 having an upward opening fitted to the upper end of the pedestal 102, and a rotating frame body 108 fitted to the front portion of the fixed frame body 107 from the front. And the left and right side plates 108 of the rotating frame 108
a, 108a, the rear end portion, one left and right longitudinal first pivot 1
09, the left and right side plates 107a, 107 of the fixed frame body 107
It is pivotally attached to a.

Further, as clearly shown in FIG. 24, the first bracket 110 is laterally projected to the upper end edges of the left and right side plates 107a, 107a in the portion of the fixed frame 107 in front of the first pivot 109. On the other hand, on the outer surfaces of the left and right side plates 108a, 108a of the turning frame 108,
A second bracket 111, which is located below the first bracket 110, is provided so as to project laterally. Then, a bolt 114 with a collar 113 is fitted and inserted into the forward tilting spring 112 mounted on the first bracket 110 from above, and the lower end of the bolt 114 is attached to the lower surface of the second bracket 111.
Lock at 15.

A horizontal piece 108b is provided at the upper end of the rotating frame 108.
The horizontal seat 108b is provided with a front seat plate 104a.
Is stuck. Therefore, the front seat plate 104a tilts forward against the forward tilting spring 112. The tilting moving body 105
Is the two frames 11 bent in a substantially L shape when viewed from the side.
6, 116, and the lower ends of both frames 116, 116 are connected by a base plate 117.
The auxiliary support 118 having a pair of left and right side plates 118a, 118a is fixed by appropriate means such as screwing or welding.
The backrest 106 is tilted rearward by pivotally attaching a middle portion of the auxiliary support 118 along the front-rear direction to the left and right side plates 107a, 107a of the fixed frame body 107 by a second pivot 119 extending laterally laterally. To configure. Second axis 1
A collar 119 a is fitted over the reference numeral 19.

The first pivot shaft 109 penetrates through the left and right side plates 118a, 118a of the auxiliary support 118 in the tilting motion body 105, and the through holes of the left and right side plates 118a, 118a through which the first pivot shaft 109 penetrates. 120 is formed in a long hole so that the tilting motion body 105 is allowed to tilt backward. Further, the tilting motion body 105 is prevented from tilting forward by bringing its front portion into contact with the upper surface of the fixed frame body 107.

Inward guide steps 121 are formed on the left and right side plates 118a, 118a of the auxiliary support 118 in the tilting motion body 105 (FIGS. 19 and 23-).
26), a slider 122 for supporting a backrest load, which constitutes a part of the interlocking mechanism, is fitted between the left and right step portions 121, 121 so as to be slidable back and forth. This slider 1
Reference numeral 22 is made of synthetic resin, and a pair of left and right protrusions 122a, 122a are formed at the front end thereof, and the protrusions 122a, 122b
A support pin 124 with a roller 123 is mounted on 22a.

On the other hand, of the portion between the left and right side plates 107a, 107a of the fixed frame body 107, the tilting motion body 1 is used.
A lever member 125, which comes into contact with the support pin 124 from above, is disposed at a position in front of the front end of the lever 05. The lever member 125 extends diagonally downward toward the front of the chair 1 when viewed from the side, at both left and right ends. Forming support pieces 125a, 125a,
The lower ends of the left and right support pieces 125a, 125a are pivotally attached to the left and right side plates 107a, 107a of the fixed frame body 107 by a third pivot 126 that is laterally oriented in the left and right direction. A collar 126a is fitted on the third pivot 126.

Further, the spring bearing 127 is provided between the upper ends of the left and right support pieces 125a, 125a of the lever member 125.
Is rotatably supported by a longitudinally extending pin 128, and the spring bearing 127
A back support coil spring 129 is mounted between the and the front plate 107b of the fixed frame body 107 as an example of spring means for elastically supporting the rearward tilting of the backrest 106. Spring support 1
27 and a front plate 107b of the fixed frame body 107 are provided with positioning protrusions 130 that prevent the back support coil spring 129 from shifting.

A downward supporting portion 125b is provided at the tip of the lever member 125 (rear end when viewed from the front of the chair), and as shown clearly in FIG.
Is in contact with the bottom surface of the auxiliary support body 118 of the tilting motion body 105, a slight gap e1 is left between the lever member 125 and the support pin 124 to ensure the slider 122 slides back and forth. I am trying to do it.

A support plate 132, which is substantially rectangular in a plan view, is provided at a portion of the lower surface of the rear seat plate 104b located above the rear portion of the slider 122, and a pair of left and right guide bodies 133, 1 are provided.
A pair of front and rear link bodies 134, 13 that are mounted so as to be slidable forward and backward at 33 (see FIG. 27) and that form a part of an interlocking mechanism at a portion between the support plate 132 and the slider 122.
Place 4

Each of the link bodies 134 is a pair of left and right link pieces 13 that are bent so as to extend substantially rearward and downward.
5, 135, a connecting pin 136 for connecting the lower ends of both link pieces 135, 135, and a connecting bar 137 for connecting the mid-height portions of both link pieces 135, 135. The upper front ends of the left and right link pieces 135, 135 are pivotally attached to the left and right side plates 118a, 118a of the auxiliary support 118 of the tilting motion body 105 by means of a pivot 138 extending in the left and right direction. Further, the locking pin 139 mounted between the upper rear ends of the left and right link pieces 135, 135 is attached to the support plate 1
It is fitted into the forward engagement groove 141 of the downward bracket piece 140 cut and raised to 32.

Further, the lower ends of the left and right link pieces 135, 135 and the connecting pin 136 are fitted into the fitting groove 142 formed in the slider 122 (see FIGS. 21 and 22). Figure 2
7, a horizontal third bracket 143 is provided on the left and right side plates 118a, 118a of the auxiliary support 118 in the tilting motion body 105 so as to project outward, and the third bracket 143 and the rear seat plate are provided. A coiled body weight application spring 144 is inserted between the rear seat plate 104b and the rear seat plate 104b against the elasticity of the body weight application spring 144. The weight application spring 1
The reference numeral 44 makes contact with the rear seat plate 104b through a through hole 145 formed in the support plate 132.

Then, a balance-shaped lock body 146 is fitted on the second pivot 119 as an example of locking means, and the rear end of the lock body 146 is fitted on the first pivot 109 to lock. The body 146 is held non-rotatable, and an elastic friction body 147 such as urethane rubber is stretched on the lower surface of the front portion of the lock body 146 (see FIGS. 21 and 26). At this time, as shown in FIG. 21, when the tilting motion body 105 is not tilted backward, the elastic friction body 147 and the slider 1 are moved.
When the tilting motion body 105 tilts backward to some extent because there is a slight gap e2 between the upper surface of the elastic friction body 147 and the upper surface of the elastic friction body 147.
The slider 122 abuts against.

The rear seat plate 104b is provided with the first pivot 109.
Since the tilting motion body 105 is supported only in a region behind the tilt motion body 105, when a person sits on the chair 101, a moment that tilts the tilting motion motion body 105 backward is generated.
In this case, the back supporting coil spring 129 is elastically deformed in advance, and the front portion of the tilting motion body 105 is pressed downward via the lever member 125, so that a person simply
The tilting motion body 105 is prevented from tilting backward when the user is sitting at 1.

In the above-described structure, when a person sits on the chair 101, the rear seat plate 104b descends while leaning backward against the elasticity of the weight application spring 144, and accordingly, as shown in FIGS. As indicated by arrow C in FIG. 26 (B), the front and rear link bodies 134, 134 rotate clockwise in the right side view of the chair 101. Then, as shown by the alternate long and short dash line in FIG. 21, the slider 122 includes the front and rear link bodies 134, 13
The connecting pin 136 of No. 4 moves forward by the pressing action. In that case, since the spring constant of the weight application spring 144 is constant, the descending amount of the rear seat plate 104b is proportional to the weight of the person sitting on the chair 101.
Move forward by an amount proportional to the weight of the person sitting on the chair 101.

When a person sitting on the chair 101 leans against the backrest 106, a large moment acts on the tilting motion body 105, thereby causing the tilting motion body 10 to move.
5 and the backrest 106 tilt rearward against the elastic force of the coil spring 129 for supporting the back, and accordingly the rear seat plate 104.
b also leans backward. In that case, the slider 122 moves forward by the amount corresponding to the weight of the person sitting on the chair 101, so that the support pin 124 abuts against the lever member 125 (that is, the operating point of the backrest load on the lever member 125). ) Approaches the third axis 126 by an amount corresponding to the weight of the person who sits on the chair 101. Therefore, the lever member 125
Back support load span L1 (see FIG. 28)
Becomes smaller according to the weight of the person sitting on the chair 1, and as a result, the elastic resistance of the back supporting coil spring 129 to the backrest load increases in proportion to the weight of the person sitting on the chair 101.

Then, as shown in FIG. 29, the slider 122 is locked by the rearward tilting of the tilting motion body 105.
When the person leans against the backrest 106, the slider 122 cannot slide due to the frictional resistance generated between the elastic friction member 147 and the slider 122. Held in the state of. Therefore, even if a person leans on the backrest 106 and floats his / her waist, the slider 122 does not unexpectedly slide. As a result, the elastic resistance of the back support coil spring 129 to the backrest 106 is adjusted in advance. It is possible to maintain a comfortable rocking state by holding it at a fixed value.

In the third embodiment, the support plate 13
When 2 slides back and forth relative to the guide body 133, the rear seat plate 104b can be smoothly lowered and tilted backward. 30 to 32 show a fourth embodiment in which the slider 122 is locked by the lever member 125 using friction.

That is, in this embodiment, the support pin 124 is used.
An elastic friction body 148 formed of urethane rubber or the like and having a substantially rectangular shape in a side view is fitted on both left and right ends of the elastic friction body 1 while the tilting motion body 105 is not tilted backward.
A slight gap is formed between the upper surface of the lever 48 and the lower surface of the lever member 125, and between the lower surface of the elastic friction member 148 and the bottom surface of the tilting motion body 105.
When 05 tilts backward, both left and right elastic friction bodies 148, 148
The backrest load is supported by the lever member 125 via the.

In the fourth embodiment, when the lever member 125 is rotated by the rearward tilting of the tilting motion body 105, the elastic friction body 1 is moved.
Since the side surface 48 is substantially rectangular, the elastic friction member 148
Corners 148a of the lever contact the bottom surface of the tilting motion body 105, and the lever member 125 is interposed via the left and right elastic friction bodies 148, 148.
A frictional resistance is generated between the tilting motion body 105 and the tilting motion body 105, so that the slider 122 is held so as not to slide back and forth.

FIGS. 33 to 35 also show a fifth embodiment in which the slider 122 is locked by the lever member 125 by utilizing friction. That is, in the fifth embodiment, a support portion 122b for the lever member 125 is formed in the front portion of the slider 122, a space 122c is formed in a rear portion of the support portion 122b, and a space 122c is formed in the space 122c. The downward protrusion 125b of the lever member 125 is formed so as to abut against the lower surface of the tilt motion body 105.

Further, while the lever member 125 is formed in an inverted trapezoidal shape in the normal cross section, the support portion 1 in the slider 122 is formed.
A pair of left and right elastic friction bodies 149, 149 with respect to the side surfaces of the lever member 125 are fixed to the upper surface of 22b as locking means, and the inner side surfaces 149a, 149a of the left and right elastic friction bodies 149, 149 are fixed to the lever member 125. When the tilting motion body 105 is rotated by forming it on an inclined surface substantially parallel to the side surface,
The lever member 125 includes the left and right elastic friction bodies 149 and 149a.
It is designed to rotate in a state that it bites in between.

Also in this third embodiment, when the tilting motion body 105 is tilted backward, a large frictional resistance is generated between the lever member 125 and the slider 122 via the elastic friction body 149, so that the slider 122 cannot move back and forth. Held in.
In the above third to fifth embodiments, the slider 122 attached to the tilting motion body 105 is locked so as to be immovable, but other members constituting the interlocking mechanism, such as the link body 134. It goes without saying that the lock may be locked inoperable. Further, the locking means is not limited to the use of the ratchet mechanism or the elastic friction body, and other means such as a clamp mechanism adapted to interlock with the rearward tilting of the tilting motion body may be adopted.

Further, the present invention is not limited to the interlocking mechanism in which the rack or slider provided on the tilting moving body is moved as in each of the above-described embodiments, but as shown conceptually in FIG. The chair 1 configured to move the spring body 129 away from the rotation center 105a of the tilt motion body 105.
It goes without saying that the present invention can be applied to other types of chairs such as 01 '.

Furthermore, the spring means for the rearward tilting of the backrest is not limited to the torsion coil spring or the compression coil spring as in the embodiment, and it goes without saying that other forms such as a leaf spring and a gas spring may be used.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view of a chair according to a first embodiment.

FIG. 2 is a sectional view taken along the line II-II of FIG. 5 with the backrest assembled.

FIG. 3 is a schematic perspective view showing attachment of a tilting motion body.

FIG. 4 is an exploded perspective view showing the outline of an interlocking mechanism.

FIG. 5 is a schematic perspective view showing attachment of a seat body and a backrest.

6 is a plan sectional view taken along line VI-VI of FIG.

FIG. 7 is a bottom view taken along the line VII-VII in FIG. 1.

8 is a sectional view taken along line VIII-VIII of FIG.

9 is a sectional view taken along line IX-IX of FIG.

10 is a cross-sectional view taken along line XX of FIG.

11 is a sectional view taken along line XI-XI of FIG.

12 is a sectional view taken along line XII-XII of FIGS. 6 and 10. FIG.

13 is a sectional view taken along line XIII-XIII in FIG.

FIG. 14 is a diagram showing a rearward tilted state of a tilting motion body.

FIG. 15 is a conceptual diagram showing an operating state when the seat body is tilted forward.

FIG. 16 is a view showing an operating state of the lock means.

FIG. 17 is a cross-sectional view of essential parts showing a second embodiment.

FIG. 18 is a right side view of the chair according to the third embodiment.

FIG. 19 is an exploded perspective view of a main part of the chair of FIG.

FIG. 20 is a plan view of FIG. 18 with a seat body omitted.

21 is a sectional view taken along line XXI-XXI of FIG. 20.

22 is a sectional view taken along line XXII-XXII of FIG.

23 is a sectional view taken along line XXIII-XXIII of FIG.

24 is a sectional view taken along line XXIV-XXIV of FIG.

25 is a sectional view taken along line XXV-XXV of FIG. 20.

FIG. 26A is a perspective view showing a mounted state of a lock body, and FIG. 26B is a perspective view showing a mounted state of a link body.

27 is a sectional view taken along line XXVII-XXVII of FIG. 20.

FIG. 28 is a main-portion cross-sectional view showing the relationship between the lever member and the slider.

FIG. 29 is a diagram showing an operation.

FIG. 30 is a perspective view showing the main parts of the fourth embodiment.

31 is a plan view of FIG. 30. FIG.

32 (A) is a sectional view taken along the line XXXVI-XXXVI of FIG. 36,
(B) is a diagram showing an operating state.

FIG. 33 is a perspective view showing a fifth embodiment.

34 is a sectional view taken along the line XXXIV-XXXIV of FIG. 33.

35 is a sectional view taken along the line XXXV-XXXV in FIG. 34.

FIG. 36 is a conceptual diagram of a chair of another form to which the present invention can be applied.

[Explanation of symbols]

 1, 101, 101 'Chair 4,104 Seat 5,106 Backrest 9,105 Tilting moving body 11 Torsion coil spring as an example of spring means 23,144 Body weight application coil spring 24 First rack 25 Pinion shaft 31 Support pin 44 Locking Means 45 Ratchet Claw 49 Rotating Member 122 Slider 131 Support Pin 125 Lever Member 129 Back Support Coil Spring 134 Link Body 146 Lock Body 147, 148, 149 Elastic Friction Body

Front page continued (72) Inventor Hiroshi Iwabuchi 1-4-18 Imafukuhigashi, Joto-ku, Osaka

Claims (1)

[Claims] 1. A seat body, and a backrest that tilts rearward against the elasticity of the spring means, wherein the spring means and the point of action of the backrest load on the spring means are applied by downward load to the seat body. A chair configured to increase the elastic resistance of the spring means against the rearward tilting of the backrest in accordance with the magnitude of the downward load on the seat by moving the seatback relative to one another via an interlocking mechanism that operates. A tilting control device for a chair, comprising: locking means for holding the interlocking mechanism in an inoperable state in relation to the rearward tilting of the backrest.